Safety device



April 14, 1925.

J. H. FLAMM SAFETY DEVICE Filed Nov. '7. 1925 3 7 noY j 4W ATTORNEY WITNESS:

Patented fipr. 14, 1925.

UNITED STATES JOHN HENRI FLAMIVI, OF

SAFETY Application filed November 7, 1923.

To all whom it 'may concern.:

Be it known that I, JOHN H. FLAMM, a citizen of the United States, residing at Baltimore, in the county of Baltimore City and State of Maryland, have invented new and useful Improvements in Safety Devices. of which the following isa specification.

This invention has reference to a lightning protector for radio.

An object is to produce a device for this purpose that comprises a spring influenced slidable switch through which electric current from the aerial wire is grounded and which is movable in an opposite direction upon engagement therewith of the plug to the radio set so that the current will be directed to the set and the return wire of the set automatically grounded.

A further object is the production of a device of this character that is automatic in action, cheaply constructed and readily installed.

To the attainment of the foregoing and other objects which will be apparent as the nature of the invention is fully understood, reference is to be had to the drawings which accompany and form part of this application.

In the drawings Figure 1 is a front elevation of the improvement.

Figure 2 is a sectional view approximately i on the line 2-2 of Figure 1.

Figure 3 is a similar sectional view with the plug inserted to influence the switch In one direction.

Figure 4 is a sectional view on the line 4-4 of Figure 2.

Figure 5 is a sectional view on the line 5-5 of Figure 3.

The casing 1 of my improvement is of some suitable insulatingmaterial, and comprises a cross-shaped member. The front of the casing is open, but is closed by a suitable plate 2, also yof insulating material. The elongated body portion of the casing has its ends reduced, and through these ends there are passed suitable securing elements 3.

In the said central portion of the casing, at the top thereof there is fixed a block 4 of copper or other electric conducting material, and on the outer face of this block, and projecting through the casing there is a binding post 5 for the aerial wire 6.

On the lower portion or bottom of the Pnrlnv'r OFFICE.

BALTIMORE, MARYLAND.

DEVICE.

Serial No. 673,366.

said casing there is a block or copper or other electric conducting material. This block has its upper face provided with a V-shaped notch 8 and its outer face provided with a binding post 9 for a ground wire l0. The block 7 is in the nature of a ground terminal. i.

Slidable in the casing there is aL switch member 11 that has its lower end pointed, as at 12 for frictional engagement with the walls of the notch 8 in the ground terminal 7. The switch is influenced to such engagement through the mediuml of a spring 12 arranged for contacting engagement with the upper end of the said switch and the lower end of the copper block 4.

The face plate for the casing has an opening 13 therethrough disposed opposite a notch in the outer face of the switch 11. rIhe lower wall of this notch is straightened and is disposed at a right angle with respect with the longitudinal plane of the said switch, but the upper wall of the said notch is arranged at an upward curvature as indicated by the numeral 14. The outer surface of the curved wall 1'4 is disposed opposite the opening 13 when the switch is closed,

y and the said wall 14 is designed for contacting engagement with the plug 15 for the radio set. Before the insertion of the plug the aerial wire 6 is grounded and the con struction thus serves as a lightning protector. When the plug is inserted the current from the aerial wire is directed throughthe block 4, spring l2, switch 11 and plug 15 to the radio set. V

In the lateral branches 16 and 17 of the casing 1 there are contacts engageable by switch arms carried by the main switch 11. These switch or conductor arms are indicated by the numerals 18 and 19 respectively and enter the main switch through bushings 2O of insulating material. The arm 18 is engageable with a contact 21 on a binding post 22 to which is connected the 'ground wire from the radio set, indicated by thc numeral 23. rIhe second arm 19 is engageable with a contact 24 on a binding post 25. To the binding post there is connected a conductor wire 26 which is also connected to the ground terminal or fixed switch member 7. The circuit maker, justk described is brought to operative position only when the plug 15 is inserted to bring the slidable switch kelement 11 out of engagement with die lined switch element or ground terminal 7.

My improvement eliminates the need ot grounding the radio set in the usual n'ianner. lhe device is automatic in action7 dependingonly upon the insertion of the plug when the radio set is required for use. ',Lhe eleinents 1S and 1S) are insulated by the bushing 20 Yroin the switch il so that liahilitv oil' short circuitin the circuit maker is thus overcome. The device is or a. simple con struction, may he readily7 lined upon any convenient support, und While have sho-Wn and described a satisiiactory en'ihodii'nent ot the improvement as it now appears to Ine, it is to be understood that il may nia-lie such departures therefrom as fairly fall within the scope of What l claim.

Having claim:-

i'i switch comprising a stationary contact.y n movable contact having a recess therein adapted to cooperate with said stationary contact, a second switch having a plurality oi stationary contacts, a har carrying` a plurality o movable contacts adapted to cooperate with said stationary contacts, Suid bar being carried by but .insulated roin the inevuhle contact of the [irst switch, a plug adapted to he connected to a translating device and adapted to engage said recess and operate said movable contact.

ln testin'iony .vliereolti i adir.; my signa ture.

described my invention7 l JOHN HENR FLAME/l. 

